FES is powering self-launchers, but not in certified EASA aircraft.
The Alisport Silent and other similar ultralight sailplanes have been self-launching reliably. Bigger sailplanes like the LAK17 have performed SL but, AFAIK, only as experimental procedures by the pilot-owner. I have personally seen it in a LAK 17cFes, when the owner of the factory was the PIC.

Aldo Cernezzi
www.voloavela.it